I am currently working on automation project along with another guy. He prepares a test case for the automation and I implement it. Here is my question, generally we use to write test cases for positive scenarios only. In Automation testing we try only positive test cases.
For a web application signup process, how many test cases can we write? As per our current scenario we are writing only one positive case(i.e.. successful signup). As per the industry standards, do we need to write a test cases for,
Validating the required fields
Validating the email validations
validating the phone number